Hi ANNEWSH,
I am Dave, I will help you with this.
Lenovo do not use custom drivers for the keyboard in that model of laptop, they use the generic Windows keyboard drivers, the only custom driver would be for the Function keys (F1 - F12) on that keyboard.
Open the Settings App
Go to Update & Security - Troubleshoot
Click Additional Troubleshooters
Run the Keyboard troubleshooter
If that does not resolve this for you
Open Device Manager
Expand the Keyboards section
Right click your keyboard and choose 'Uninstall'
Then restart your laptop